Surface functionalized N-C-TiO2/C nanocomposites derived from metal-organic framework in water vapour for enhanced photocatalytic H2 generation
Hussain, MZ; Yang, Z; van der Linden, B; et al.Huang, Z; Jia, Q; Cerrato, E; Fischer, RA; Kapteijn, F; Zhu, Y; Xia, Y
Date: 4 September 2020
Journal
Journal of Energy Chemistry
Publisher
Elsevier
Publisher DOI
Abstract
Surface-functionalized nitrogen/carbon co-doped polymorphic TiO2 phase junction nanoparticles
uniformly distributed in porous carbon matrix were synthesized by a simple one-step pyrolysis of
titanium based metal-organic framework (MOF), NH2-MIL-125(Ti) at 700 ºC under water vapour
atmosphere. Introducing water vapour during the ...
Surface-functionalized nitrogen/carbon co-doped polymorphic TiO2 phase junction nanoparticles
uniformly distributed in porous carbon matrix were synthesized by a simple one-step pyrolysis of
titanium based metal-organic framework (MOF), NH2-MIL-125(Ti) at 700 ºC under water vapour
atmosphere. Introducing water vapour during the pyrolysis of NH2-MIL-125(Ti) not only
functionalizes the derived porous carbon matrix with carboxyl groups but also forms additional
oxygen-rich N like interstitial/intraband states lying above the valence band of TiO2 along with
the self-doped carbon, which further narrows the energy band gaps of polymorphic TiO2
nanoparticles that enhance photocatalytic charge transfer efficiency. Without co-catalyst, sample
N-C-TiO2/CArW demonstrates H2 evolution activity of 426 µmol gcat
-1
h
-1
, which remarkably
outperforms commercial TiO2 (P-25) and N-C-TiO2/CAr with a 5-fold and 3-fold H2 generation,
respectively. This study clearly shows that in water vapour atmosphere during the pyrolysis
increases the hydrophilicity of the Ti-MOF derived composites by the functionalization of porous
carbon matrix with carboxylic groups, significantly enhancing the electrical conductivity and
charge transfer efficiency due to the formation of additional localized oxygen-rich N like
interstitial/intraband states. This work also demonstrates that by optimizing the anatase-rutile
phase composition of the TiO2 polymorphs, tuning the energy band gaps by N/C co-doping and
functionalizing the porous carbon matrix in the N-C-TiO2/C nanocomposites, the photocatalytic
H2 generation activity can be further enhanced.
Engineering
Faculty of Environment, Science and Economy
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